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I asked a question (In some cases, "come" and "go" are interchangeable, right?) just now, and added some explanation at the beginning.

This post is discussing verbs, the following scenario is to add background for discussion.

Is "add background" an idiomatic expression? Is there other beginning more appropriate for this kind of scenarios?

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It's idiomatic in the sense that it sounds natural, like what a native English speaker would say, but it's not an "idiomatic expression" in the sense of a formulaic phrase. For example, "hold your horses" is an idiomatic expression meaning "be patient."

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